Splice
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 I have found that most of my issues with Splice All can actually be resolved in the "Headers Handling, Language and Other Customizations" section. It seems a lot of sites are pretty picky. Also, if you have squidguard set to not allow IP addresses that leads to a lot of problems with things like the Apple store and Netflix. Oddly, when I used nested pfsense boxes, one for the gateway and one for squid and squidguard it seemed to work flawlessly (and VERY fast). Now that I moved the same VM to be the gateway that was doing proxy… my web browsing seems to stink on all clients except the ones that bypass squid. 
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 My devices use the Pfsense as DNS but I still have this problem Oddly Now mine works flawlessly even with my win DNS set on clients… No idea... :S This is my "Headers Handling, Language and Other Customizations" conf 
 X-Forwarded Header Mode: on
 Disable VIA Header: uncheked
 (other options seem to me not relevat)For MrWinig: can you clear/explain better which option to set? 
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 Strange. I can never get it to work right with the fbook app and google store even with squidguard disabled. thanks all for posting your feedback 
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 UPDATE 
 Since Two days ago I had started to tested the conf on 2 client computer: mine (test) and a user's one (production)
 Everything worked fine on both (http+https)
 This morning, the production pc has stopped to work in https and slowed down on http, mine test pc has had no issue!After a a while, without changing nothing, production pc has stared to work flawlessly again. 
 :S
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 UPDATE 2 
 I missed to notice I had "Server proxy" option set on windows "Lan settings" of test PC.
 Server proxy settings is the following
 <squid_ip>3128 (all service http+https+ftp)Now I cannot understand why this works (https port is 3129 in my conf) 
 BTW i tested the same conf on the production client and it works flawlessly (squidguard also)</squid_ip>
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 Thank you for always keeping us up to date. So if I understand right you had proxy settings set? you should't have had anything in transparent mode. What did you change exactly to solve it? 
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 So if I understand right you had proxy settings set? Yes you should't have had anything in transparent mode. What did you change exactly to solve it? In Squid I did NOT change anything (see my conf above), transparent mode is on. 
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 I do not know if we are miss understanding each other, but if you have squid in transparent mode, you shouldn't have set anything on your PC 
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 No missunderstanding, It's like that, and that is the concearn… Indeed this kind of conf is described here...https://forum.pfsense.org/index.php?topic=112335.0 
 I'm trying to understand why and how it works!If someone kindly could explain to me.... :) 
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 Dude. in that guide he is showing you both ways transparent and non transparent, If you choose transparent in squid you do nothing at all to the client, If you want a manual proxy then you set the proxy setting on client